Al-Ju'ayd bin Abdul Rahman said: I heard Sayyiduna al-Sa'ib bin Yazid (may Allah be pleased with him) say: My maternal aunt took me to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah, my sister's son is ill. So he (peace and blessings be upon him) passed his hand over my head and supplicated for blessing for me, then he performed ablution, and I drank the water of his (peace and blessings be upon him) ablution. Then I stood behind his (peace and blessings be upon him) back, and I saw the Seal of Prophethood between his (peace and blessings be upon him) shoulders, like the button of a canopy.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6652